native species; indigenous species
Refers to a species that is originally from a particular region, as opposed to introduced or invasive species. Often used in ecological, agricultural, and biological contexts.
Activities are being carried out to protect the native species of this region.
Native vegetable varieties are adapted to the local climate.
固有種 means 'endemic species', a species found only in a specific area. 在来種 is broader and simply means native to a region, not necessarily exclusive to it.
Compound of 在来 (ざいらい, 'pre-existing, conventional') and 種 (しゅ, 'species, kind'). The term is used in modern Japanese primarily in ecological and agricultural contexts.